Ca. 100-300 AD.
A black gemstone intaglio depicting a left-facing portrait of a male wearing a helmet; set in a possibly later gold ring with a round band gradually expanding to triangular-shaped shoulders, accentuated with chiseled decoration.
Size: D: 18.80mm / US: 8 7/8 / UK: R 1/2; 14.73g
Provenance: Private London collection; British art market 1990s.